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2 Species and Speciation PHYLOGENETICS Theory and Practice of Phylogenetic Systematics Second Edition E. O. WILEY BRUCE S. LIEBERMAN A John Wiley & Sons, Inc., Publication Copyright © 2011 by Wiley-Blackwell. All rights reserved. Published by John Wiley & Sons, Inc., Hoboken, New Jersey. Published simultaneously in Canada. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 U.S. Copyright Act, without either the prior written permission of the publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 750-4470, or www.copyright.com. Requests to the publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or at www.wiley.com/go/permission. Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifi cally disclaim any implied warranties of mer- chantability or fi tness for a particular purpose. No warranty may be created or extended by sales rep- resentatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. Neither the publisher nor the author shall be liable for any loss of profi t or any other commercial damages, including but not limited to special, incidental, consequential, or other damages. For general information on our other products and services or for technical support, please contact our Customer Care Department within the United States at (800) 762-2974, outside the United States at (317) 572-3993 or fax (317) 572-4002. Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic formats. For more information about Wiley products, visit our website at www.wiley.com. Library of Congress Cataloging-in-Publication Data: Phylogenetics: theory and practice of phylogenetic systematics / by E. O. Wiley & Bruce S. Lieberman. p. cm. Includes index. ISBN 978-0-470-90596-8 (cloth) 1. Phylogeny. 2. Biology—Classifi cation. 3. Cladistic analysis. I. Wiley, E. O. II. Lieberman, Bruce S. QH83.W52 2011 576.8'8–dc22 2010044283 Printed in Singapore. oBook ISBN: 978-1-118-01788-3 ePDF ISBN: 978-1-118-01786-9 ePub ISBN: 978-1-118-01787-6 10 9 8 7 6 5 4 3 2 1 CONTENTS Preface to the Second Edition xiii Preface to the First Edition xv Chapter 1. Introduction 1 Phylogenetic Propositions 3 Topics Covered 6 Terms and Concepts 7 Disciplines 8 Organisms and Grouping of Organisms 9 Phylogenetic History and Evolution 11 Attributes of Organisms 13 Classifi cation 15 Philosophy and Systematics 16 The Form of Phylogenetic Hypotheses 19 Chapter Summary 21 Chapter 2. Species and Speciation 23 What Is It to Be a Species? 24 Species as Kinds 24 Species as Sets 26 Species as Individuals 27 Species Concepts 27 Process-Based Concepts 29 The Evolutionary Species Concept 30 Justifi cations for the ESC 32 Variations on the ESC 33 v vi CONTENTS Process-Based Concepts Emphasizing Reproductive Isolation 34 Phylogenetic Species Concepts 36 Some Additional Species Concepts 37 Sorting through Species Concepts 38 Speciation: Modes and Patterns 39 Allopartic Speciation 41 Allopartic Mode I: Vicariance 42 Allopatric Speciation, Mode II Peripatric Speciation 44 Distinguishing between Allopatric Modes of Speciation 44 Parapatric Speciation 49 Sympatric Speciation 49 Identifying Modes of Speciation in the Fossil Record 50 The Evolutionary Species Concept, Speciation, and Ecology 54 Empirical Methods for Determining Species Limits 54 Nontree-Based Methods 55 Tree-Based Methods 61 Chapter Summary 65 Chapter 3. Supraspecifi c Taxa 66 Concepts of Naturalness and Supraspecifi c Taxa 67 The Natural Taxon 68 Monophyly, Paraphyly and Polyphyly 70 Hennig’s Concepts Placed in History 72 Natural Higher Taxa as Monophyletic Groups sensu Hennig (1966) 73 Logical Consistency: The Hallmark of Proposed Natural Classifi cations 74 Paraphyletic Groups Misrepresent Character Evolution 80 Paraphyly and Polyphyly: Two Forms of Nonmonophyly 81 Node-Based and Stem-Based Monophyly: Same Concept Different Graphs 83 Chapter Summary 83 Chapter 4. Tree Graphs 85 Phylogenetic Trees 87 Stem-Based Phylogenetic Trees 87 Node-Based Phylogenetic Trees 89 Cyclic Graphs 91 Cladograms 92 Nelson Trees in Phylogenetics 92 From Nelson Trees to Phylogenetic Trees 93 Gene Trees 99 Individuals versus Sets of Individuals Used in an Analysis 99 Representing Character Evolution on Trees 100 Unrooted Trees and Their Relationship to Phylogenetic Trees 101 Node Rotation 102 CONTENTS vii Other Kinds of Tree Terminology 103 Concepts of Monophyly and Trees 104 Chapter Summary 106 Chapter 5. Characters and Homology 107 A Concept of Character 107 Character States as Properties 109 Shared Character States 110 Historical Character States as Properties 111 Ahistorical Kind Properties 112 Historical Groups and Natural Kinds 113 Homology 114 Haszprunar’s Homology Synthesis 115 Concepts of Homology in Systematics 117 Phylogenetic Characters and Phylogenetic Homology: An Overview 118 Taxic Homologies as Properties of Monophyletic Groups 119 Transformational Homology: Linking Different Hypotheses of Qualitative Identity in a Transformation Series 121 Discovering and Testing Homology 122 Patterson’s Tests 124 Similarity and Remane’s Criteria 124 Similarity in Position: Morphology 124 Similarity in Position: Molecular Characters 125 Special or Intrinsic Similarity 129 Stacking Transformations: Intermediate Forms 131 Conjunction 132 Phylogenetic Homology (Forging Congruence between Hennig’s and Patterson’s Views) 136 Avoiding Circularity: How Congruence Works 136 Working with Characters 137 Qualitative versus Quantitative Characters: Avoiding Vague Characters 139 Morphometrics and Phylogenetics 140 Characters, Transformation Series, and Coding 144 Complex Characters or Separate Characters? 147 Missing Data 147 Homology and “Presence-Absence” Coding 149 Chapter Summary 150 Chapter 6. Parsimony and Parsimony Analysis 152 Parsimony 152 Parsimony: Basic Principles 153 Kinds of Parsimony 154 Classic Hennigian Argumentation 154 Polarization 156 Example 1. The Phylogenetic Relationships of Leysera 162 viii CONTENTS A Posteriori Character Argumentation 166 Algorithmic versus Optimality Approaches 166 Optimality-Driven Parsimony 168 Determining Tree Length 169 Finding Trees 171 Random Addition Searches 172 Rearranging Tree Topologies 173 The Parsimony Ratchet 175 Simulated Annealing 176 Optimizing Characters on Trees 176 ACCTRAN Optimization 177 DELTRAN Optimization 178 Summary Tree Measures 179 Example 2: Olenelloid Trilobites 184 Evaluating Support 188 Using Consensus Techniques to Compare Trees 193 Statistical Comparisons of Trees 195 Weighting Characters in Parsimony 196 A Priori Weighting 196 Weighting by Performance 198 Weighting by Character Elimination 199 Weighting: Concluding Remarks 199 Phylogenetics Without Transformation? 199 Chapter Summary 202 Chapter 7. Parametric Phylogenetics 203 Maximum Likelihood Techniques 205 Simplicity 209 Likelihood in Phylogenetics: An Intuitive Introduction 210 Likelihood in Phylogenetics: A More Formal Introduction 212 Selecting Models 218 Bayesian Analysis 219 Interpreting Models in a Phylogenetic Context 226 Chapter Summary 227 Chapter 8. Phylogenetic Classifi cation 229 Classifi cations: Some General Types 230 Classifi cation of Natural Kinds 230 Historical Classifi cations (Systematizations) 231 Convenience Classifi cations 233 Biological Classifi cations 233 Constituents and Grouping in Phylogenetic Classifi cations 233 The Linnean Hierarchy 234 Defi nition of Linnean Higher Categories 235 Conventions for Annotated Linnean Classifi cations 236 Ancestors in Phylogenetic Classifi cation 241 Species and Higher Taxa of Hybrid Origin 244 CONTENTS ix Alternative Methods of Classifying in the Phylogenetics Community 245 The PhyloCode 248 PhyloCode Controversies 250 Stability of Names Relative to Clade Content 253 Proper Names of Taxa 255 The Future of Linnean Nomenclature 257 Alternative “Schools” and Logical Consistency 258 Chapter Summary 258 Chapter 9. Historical Biogeography 260 The Distinction between Ecological and Phylogenetic Biogeography and the Importance of Congruence 261 Hierarchies of Climate and Geological Change and Their Relationship to Phylogenetic Biogeographic Patterns and Processes 264 The Importance of Vicariance in the Context of Evolutionary Theory 265 The Importance of “Dispersal” in Phylogenetic Biogeography 265 Geodispersal: Not Dispersal 266 Historical Perspective on Geodispersal and the Cyclical Nature of Oscillations between Vicariance and Geodispersal 270 Areas and Biotas 271 “Area” as It Relates to Phylogenetic Biogeographic Analysis 274 The Boundaries of Biotic Areas and Comparing the Geographic Ranges of Taxa 277 Conclusions 278 Analytical Methods in Phylogenetic Biogeography 278 Historical Biogeography Using Modifi ed Brooks Parsimony Analysis 280 Overview of MBPA 282 Steps 1 and 2: Fitch Optimization of Area States on a Phylogeny 285 Area Distributions 288 Step 3.1: The Vicariance Matrix
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